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Topic: CaO solublity in H2O  (Read 2277 times)

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Offline curiouscat

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CaO solublity in H2O
« on: January 06, 2013, 02:15:58 AM »
I expect CaO when mixed with H2O reacts like so:

CaO (s) + H2O (l)  ::equil::  Ca(OH)2 (aq)

Why then does Wikipedia mention a solubility in H2O as: 1.19 g/L (25 °C)? When a solid reacts with H2O what does "solubility" mean?

From stoichiometry alone a Litre of H2O ~ 50 mol ~ 2.5 kg of CaO. What am I getting wrong?


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Offline Borek

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Re: CaO solublity in H2O
« Reply #1 on: January 06, 2013, 04:24:53 AM »
Ca(OH)2 itself is weakly soluble, so I suppose what they mean is that after you add more than 1.19 g per L it will still react with water, but the product will be not dissolved.
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Offline curiouscat

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Re: CaO solublity in H2O
« Reply #2 on: January 06, 2013, 08:23:45 AM »
Quote from: Borek on January 06, 2013, 04:24:53 AM
Ca(OH)2 itself is weakly soluble, so I suppose what they mean is that after you add more than 1.19 g per L it will still react with water, but the product will be not dissolved.

Thanks! 
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